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-rw-r--r--core/dive.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/core/dive.c b/core/dive.c
index 9db233dca..8c74bc24b 100644
--- a/core/dive.c
+++ b/core/dive.c
@@ -3653,6 +3653,9 @@ fraction_t best_o2(depth_t depth, struct dive *dive)
fraction_t fo2;
fo2.permille = (prefs.bottompo2 * 100 / depth_to_mbar(depth.mm, dive)) * 10; //use integer arithmetic to round down to nearest percent
+ // Don't permit >100% O2
+ if (fo2.permille > 1000)
+ fo2.permille = 1000;
return fo2;
}